Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7973830 | Materials Science and Engineering: A | 2018 | 28 Pages |
Abstract
The chemical composition of a Mg-1.1Al-0.33Ca-0.44Mn (wt%) alloy, AXM10304, has been optimized for high speed extrusion. The extrudability is substantially improved from 24Â m/min to 60Â m/min by slightly reducing the Ca content from 0.33Â wt% to 0.24Â wt%. Then, the effect of Mn content on the mechanical properties and microstructures of extruded Mg-1.1Al-0.24Ca based alloys were investigated. In a solution-treated condition, tensile yield stress is enhanced to 200Â MPa with increasing Mn content up to 0.68Â wt% and the compressive yield stress is also improved to 164Â MPa with increasing Mn content up to 1.0Â wt% due to grain size refinement. After an artificial aging, Guinier Preston zones were dispersed within the Mg matrix, and the tensile and compressive yield stresses are increased by 70Â MPa and 30Â MPa regardless of the Mn content. Consequently, the peak-aged 1.1Al-0.24Ca-1.0Mn alloy, AXM1021, exhibits high tensile and compressive yield stresses of 263Â MPa and 197Â MPa with a good yield asymmetry of 0.74 (a ratio of compressive yield stress to tensile one).
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
T. Nakata, C. Xu, R. Ajima, Y. Matsumoto, K. Shimizu, T.T. Sasaki, K. Hono, S. Kamado,